Bump shivammathur/setup-php in the actions group across 1 directory

Bumps the actions group with 1 update in the / directory: [shivammathur/setup-php](https://github.com/shivammathur/setup-php).


Updates `shivammathur/setup-php` from 2.30.4 to 2.31.1
- [Release notes](https://github.com/shivammathur/setup-php/releases)
- [Commits](shivammathur/setup-php@c665c7a...c541c15)

---
updated-dependencies:
- dependency-name: shivammathur/setup-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/phpmd.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@c665c7a15b5295c2488ac8a87af9cb806cd72198
+        uses: shivammathur/setup-php@c541c155eee45413f5b09a52248675b1a2575231
         with:
           coverage: none
           tools: phpmd